UL 498 Figure 139.1 Compliant Small Test Probe

This UL 498 Figure 139.1 compliant small test probe is engineered for precise verification of structural and dimensional compliance of plugs and sockets with UL 498 standards, specifically meeting the requirements outlined in Figure 139.1. The probe maintains strict conformity to standard specifications for dimensions, tolerances, material properties, and surface finish, with excellent dimensional stability and reliable performance to support accurate electrical component inspection.

Specifications:

• Applicable standard: UL 498 “Attachment Plugs and Receptacles” (Figure 139.1)
• Probe diameter: 0.031±0.002 inches
• Corner radius: 0.002 inches
• Overall length: 2.00±0.010 inches
• Material hardness: ≥50 HRC
• Material thermal expansion coefficient: Minimal, ensuring stable dimensions and tolerances
• Dimensional tolerances: Compliant with UL 498 standard requirements
• Surface roughness: Meets UL 498 specified criteria

Test Procedures:

1. Inspect the test probe for cleanliness, physical damage, or dimensional anomalies prior to use.
2. Secure the plug or socket under test in a fixed fixture to prevent displacement during inspection.
3. Align the probe with the target testing position as specified in UL 498 Figure 139.1.
4. Perform structural and dimensional inspection by guiding the probe through relevant features of the test sample.
5. Verify whether the product’s structure and dimensions align with tolerances and specifications outlined in UL 498.
6. Document test results and confirm compliance with standard requirements.

Applications:

• Structural and dimensional inspection of plugs and sockets to ensure compliance with UL 498 standards
• Quality control processes in electronics and electrical appliance manufacturing
• Conformity testing for plug and socket products on production lines and in workshops
• R&D testing for optimizing plug and socket component design
• Compliance verification in third-party testing laboratories and certification facilities